(no commit message)

[utils] / support / general / src / main / java / org / wamblee / observer / Observable.java

diff --git a/support/general/src/main/java/org/wamblee/observer/Observable.java b/support/general/src/main/java/org/wamblee/observer/Observable.java
index 2980afafd33dbc63a0a7416e6aed4ca7cb2396c9..f31ba0dc485d1b839ceb8e354c9d0d0e15f657e5 100644 (file)
--- a/support/general/src/main/java/org/wamblee/observer/Observable.java
+++ b/support/general/src/main/java/org/wamblee/observer/Observable.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2005 the original author or authors.
+ * Copyright 2005-2010 the original author or authors.
  * 
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -13,43 +13,37 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
 package org.wamblee.observer;
 
-import java.util.List;
 import java.util.ArrayList;
+import java.util.List;
 import java.util.Map;
 import java.util.TreeMap;
 
-import org.apache.log4j.Logger;
-
 /**
  * Implements subscription and notification logic for an observer pattern. This
  * class is thread safe.
  */
 public class Observable<ObservableType, Event> {
-
-    private static final Logger LOGGER = Logger.getLogger(Observable.class);
-
     /**
      * Observable.
      */
-    private ObservableType _observable;
+    private ObservableType observable;
 
     /**
      * Used to notify observers.
      */
-    private ObserverNotifier<ObservableType, Event> _notifier;
+    private ObserverNotifier<ObservableType, Event> notifier;
 
     /**
      * Map of subscription to observer.
      */
-    private Map<Long, Observer<ObservableType, Event>> _observers;
+    private Map<Long, Observer<ObservableType, Event>> observers;
 
     /**
      * Counter for subscriptions. Holds the next subscription.
      */
-    private long _counter;
+    private long counter;
 
     /**
      * Constructs the observable.
@@ -60,11 +54,11 @@ public class Observable<ObservableType, Event> {
      *            Object used for implementing notification of listeners.
      */
     public Observable(ObservableType aObservable,
-            ObserverNotifier<ObservableType, Event> aNotifier) {
-        _observable = aObservable;
-        _notifier = aNotifier;
-        _observers = new TreeMap<Long, Observer<ObservableType, Event>>();
-        _counter = 0;
+        ObserverNotifier<ObservableType, Event> aNotifier) {
+        observable = aObservable;
+        notifier = aNotifier;
+        observers = new TreeMap<Long, Observer<ObservableType, Event>>();
+        counter = 0;
     }
 
     /**
@@ -75,9 +69,11 @@ public class Observable<ObservableType, Event> {
      * @return Event Event to send.
      */
     public synchronized long subscribe(Observer<ObservableType, Event> aObserver) {
-        long subscription = _counter++; // integer rage is so large it will
-                                        // never roll over.
-        _observers.put(subscription, aObserver);
+        long subscription = counter++; // integer rage is so large it will
+        // never roll over.
+
+        observers.put(subscription, aObserver);
+
         return subscription;
     }
 
@@ -90,10 +86,11 @@ public class Observable<ObservableType, Event> {
      *             In case the subscription is not known.
      */
     public synchronized void unsubscribe(long aSubscription) {
-        Object obj = _observers.remove(aSubscription);
+        Object obj = observers.remove(aSubscription);
+
         if (obj == null) {
-            throw new IllegalArgumentException("Subscription '" + aSubscription
-                    + "'");
+            throw new IllegalArgumentException("Subscription '" +
+                aSubscription + "'");
         }
     }
 
@@ -103,7 +100,7 @@ public class Observable<ObservableType, Event> {
      * @return Number of subscribed observers.
      */
     public int getObserverCount() {
-        return _observers.size();
+        return observers.size();
     }
 
     /**
@@ -116,31 +113,14 @@ public class Observable<ObservableType, Event> {
         // Make sure we do the notification while not holding the lock to avoid
         // potential deadlock
         // situations.
-        List<Observer<ObservableType, Event>> observers = new ArrayList<Observer<ObservableType, Event>>();
+        List<Observer<ObservableType, Event>> myObservers = new ArrayList<Observer<ObservableType, Event>>();
+
         synchronized (this) {
-            observers.addAll(_observers.values());
+            myObservers.addAll(observers.values());
         }
-        for (Observer<ObservableType, Event> observer : observers) {
-            _notifier.update(observer, _observable, aEvent);
-        }
-    }
 
-    /*
-     * (non-Javadoc)
-     * 
-     * @see java.lang.Object#finalize()
-     */
-    @Override
-    protected void finalize() throws Throwable {
-        if (_observers.size() > 0) {
-            LOGGER
-                    .error("Still observers registered at finalization of observer!");
-            for (Observer observer : _observers.values()) {
-                LOGGER.error("  observer: " + observer);
-            }
+        for (Observer<ObservableType, Event> observer : myObservers) {
+            notifier.update(observer, observable, aEvent);
         }
-
-        super.finalize();
     }
-
 }